/*
 * Copyright (c) 2007-2012, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 */
/*
 * Copyright 1999-2004 The Apache Software Foundation.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/*
 * $Id: FuncExtElementAvailable.java,v 1.2.4.1 2005/09/14 19:58:32 jeffsuttor Exp $
 */
package com.sun.org.apache.xpath.internal.functions;

import com.sun.org.apache.xalan.internal.templates.Constants;
// J2SE does not support Xalan interpretive
/*
import com.sun.org.apache.xalan.internal.transformer.TransformerImpl;
*/
import com.sun.org.apache.xml.internal.utils.QName;
import com.sun.org.apache.xpath.internal.ExtensionsProvider;
import com.sun.org.apache.xpath.internal.XPathContext;
import com.sun.org.apache.xpath.internal.objects.XBoolean;
import com.sun.org.apache.xpath.internal.objects.XObject;

/**
 * Execute the ExtElementAvailable() function.
 * @xsl.usage advanced
 */
public class FuncExtElementAvailable extends FunctionOneArg {
    static final long serialVersionUID = -472533699257968546L;

    /**
     * Execute the function.  The function must return
     * a valid object.
     * @param xctxt The current execution context.
     * @return A valid XObject.
     *
     * @throws javax.xml.transform.TransformerException
     */
    public XObject execute(XPathContext xctxt) throws javax.xml.transform.TransformerException {

        String prefix;
        String namespace;
        String methName;

        String fullName = m_arg0.execute(xctxt).str();
        int indexOfNSSep = fullName.indexOf(':');

        if (indexOfNSSep < 0) {
            prefix = "";
            namespace = Constants.S_XSLNAMESPACEURL;
            methName = fullName;
        } else {
            prefix = fullName.substring(0, indexOfNSSep);
            namespace = xctxt.getNamespaceContext().getNamespaceForPrefix(prefix);
            if (null == namespace)
                return XBoolean.S_FALSE;
            methName = fullName.substring(indexOfNSSep + 1);
        }

        if (namespace.equals(Constants.S_XSLNAMESPACEURL) || namespace.equals(Constants.S_BUILTIN_EXTENSIONS_URL)) {

            // J2SE does not support Xalan interpretive
            /*
            try {
            TransformerImpl transformer = (TransformerImpl) xctxt.getOwnerObject();
            return transformer.getStylesheet().getAvailableElements().containsKey(
                                                                new QName(namespace, methName))
                   ? XBoolean.S_TRUE : XBoolean.S_FALSE;
            } catch (Exception e) {
            return XBoolean.S_FALSE;
            }
            */
            return XBoolean.S_FALSE;
        } else {
            //dml
            ExtensionsProvider extProvider = (ExtensionsProvider) xctxt.getOwnerObject();
            return extProvider.elementAvailable(namespace, methName) ? XBoolean.S_TRUE : XBoolean.S_FALSE;
        }
    }
}
